Volume Damper Low-Leak OBD 3000-0BDLL-64X20 T-Bar listed Fire-Resistance Diffusers * TVB

listed Fire-Resistance Diffusers * TVB - Thermal Vapor Blanket * Square collar

60% free area * Soft White Options * Countersunk screwholes with matching Phillips #8 x 1-1/2" oval Screws * 10 or 12 gauge steel * Tamper proof screws

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening  (front blades parallel to shortest dimension)

3-way register with stiffened 1/2" fan shaped louvers for silent operation

Standard Features * 1/2" x 1/2" x 1/2" aluminum lattice return air grille * Surface mount grille with

Volume Damper Low-Leak OBD 3000-0BDLL-64X20 T-Bar listed Fire-Resistance Diffusers * TVBh3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3.